Bobbin winding mechanism for a sewing machine
AssigneeThe Singer Company
InventorRalph E. Johnson
Life of this patent
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Abstract
A sewing machine is provided with a spring biased platform and bobbin which are movable by the throat plate of the machine into a position wherein the bobbin is disposed to receive the lower limb of a loop of needle thread and to effect an operative connection between the bobbin and drive shaft providing for rotation of the bobbin as required for bobbin winding. An electrical switch operable by the thread of a full bobbin is provided to discontinue rotation of the bobbin drive shaft.
Claims11
In a sewing machine, the combination comprising a reciprocable needle, a rotatable vertical axis needle thread looptaker, a bobbin case nested in the looptaker;
- means restraining the bobbin case from rotating, a bobbin in the bobbin case, a spring biased platform which supports the bobbin in the bobbin case, a bobbin winding drive shaft, and a throat plate movable over the bobbin and engageable in a partially closed position with the bobbin for depressing the bobbin and platform into a position wherein the bobbin is in driving engagement with the bobbin drive shaft and the bobbin is disposed to receive for bobbin winding the lower limb of a loop of needle thread moved about the bobbin case by the looptaker.
Dependencies are inferred from the claim text.